CVE-2006-2940 Denial of service in n/a

High 7.8 Published 28 Sep 2006 Updated 7 Aug 2024

Attackers can cause denial of service via CPU exhaustion by sending X.509 certificates with large RSA public keys during signature verification.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2006-2940?

CVE-2006-2940 is a high-severity denial of service vulnerability in Openssl Openssl, published on 28 Sep 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows attackers to cause a denial of service (CPU consumption) via parasitic public keys with large (1) "public exponent" or (2) "public modulus" values in X.509 certificates that require extra time to process when using RSA signature verification.

Weakness: CWE-399

Which versions are affected by CVE-2006-2940?

It affects 1 product.

Products include Openssl Openssl.

How do I fix CVE-2006-2940?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2006-2940 being exploited?

There is no known exploitation of CVE-2006-2940 in the wild and no public exploit code.

All Openssl Openssl vulnerabilities

Sources

Also known as DEBIAN-CVE-2006-2940, GHSA-6qr5-8633-2jmp.